#canvas {
  background: #ffffff;
  cursor: pointer;
  margin-left: 10px;
  margin-top: 10px;
  -webkit-box-shadow: 4px 4px 8px rgba(0,0,0,0.5);
  -moz-box-shadow: 4px 4px 8px rgba(0,0,0,0.5);
  box-shadow: 4px 4px 8px rgba(0,0,0,0.5);
}